Hammer



FIG. 1 is an isometric view of a hammer;

FIG. 2 is a first side-view of the hammer;

FIG. 3 is a second side-view of the hammer;

FIG. 4 is a first end-view of the hammer;

FIG. 5 is a second end-view of the hammer;

FIG. 6 is a bottom view of the hammer; and,

FIG. 7 is a top view of the hammer. 

What is claimed is the ornamental design for a hammer, as shown and described. 